Rudolf Steiner went to Weimar to edit the scientific writings of
Goethe for the Kürschner edition of the “German National
Literature.” Along with sorting and arranging Goethe's works,
Steiner wrote introductions and commentaries that have been collected
and published in English translation under the titles,
Goethe the Scientist,
Goethean Science or
Nature's Open Secret.
Originally published in German as,
Einleitung Zu Goethes Naturwissenschaftliche Schriften, 1883.

Chapter titles:
Introduction,
How Goethe's Theory of Metamorphosis Arose,
How Goethe's Thoughts on the Development of the Animals Arose,
The Nature and Significance of Goethe's Writings on Organic Morphology,
Concluding Remarks on Goethe's Morphological Views,
Goethe's Way of Knowledge,
The Arrangement of Goethe's Natural-scientific Writings,
From Art to Science,
Goethe's Epistemology,
Knowing and Human Action in the Light of Goethean Way of Thinking,
Relationship of the Goethean Way of Thinking to Other Views,
Goethe and Mathematics,
Goethe's Basic Geological Principle,
Goethe's Meteorological Conceptions,
Goethe and Natural-scientific Illusionism,
Goethe as Thinker and Investigator,
Goethe Against Atomism,
Goethe's World View in his "Aphorisms in Prose."

This book is a cornerstone of the foundations of Anthroposophy.
Consider this famous passage from it:
“Inasmuch as thinking takes possession of the idea, thinking
fuses with the primal ground of world existence; what is at work
outside enters into the spirit of man: he becomes one with objective
reality in its highest potency. Becoming aware of the idea within
reality is the true communion of man.”